Make sure only values under 20 can be used for the `orderHint` frontmatter

[timonrey]

part of https://github.com/commercetools/commercetools-docs/issues/5256

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Latest commit: f9d3e65ac9dd72bd6dbf3cf8b48ec9bca031ed77

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| Name | Type | | ----------------------------------------------- | ----- | | @commercetools-docs/gatsby-theme-docs | Patch | | @commercetools-website/api-docs-smoke-test | Patch | | @commercetools-website/docs-smoke-test | Patch | | @commercetools-website/documentation | Patch | | @commercetools-website/self-learning-smoke-test | Patch | | @commercetools-website/site-template | Patch |

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